SU1646008A2 - Device for signalling and control over serviceability of relay protection - Google Patents

Description

one

(61) 1457013 (21) 4682716/07 (22) 02.15.89 (46) 04.30.91. Bul Number 16

(71) Ural Polytechnic Institute. S.M. Kirov

(72) L. A. Lystsova and V. P. Fedotov (53) 621.316.925 (088.8)

(56) USSR Author's Certificate N 1457013, cl. H 01 H 69 / 01.1987.

(54) DEVICE FOR SIGNALING AND CONTROL OF RELAY PROTECTION CORRECTION

(57) The invention relates to relay protection and emergency control of electrical installations. The purpose of the invention is to increase reliability by preventing the relay protection actions during the ko process (trolling the shutdown as a result of not returning to the initial state of any of its steps after the next check. The goal is achieved by providing the device for signaling and monitoring the health of the relay protection, additionally the third, fourth, and fifth elements AND, the delay element, the second RS trigger, and the third indicator were introduced. 1 Il.

The invention relates to relay protection and emergency automation of electrical installations, and is intended to signal the operation and to monitor the health of multi-stage relay protection devices without removing them from work and without disabling the protected object.

The purpose of the invention is to increase reliability by preventing the relay protection actions in the process of monitoring for tripping as a result of non-return to the initial state of any of its steps after the next check.

The drawing shows a diagram of the device.

The device for signaling and monitoring the protection of the relay protection contains serially connected input unit 1, measuring logic 2 and output 3 relay protection blocks 4, and relay protection 4 consists of n measuring logic blocks 21, 22, ... 2P according to the number of its steps , the switching mechanism of the switching device 5, the source of the control signal 6, the control key 7 with a neutral position with the first 8 and second 9 closing contacts, the first elements AND 10i, 102 .... 10P, whose direct inputs through the first closing contact 8 to yucha control 7 are connected to a control signal source 6, and outputs connected to inputs of the measuring and logic units 2 at the corresponding levels relaying 4, the first n indicators 111,

112, ... 11p, p RS-flip-flops 12i, 12212P and p

second elements And 13i. 132 13P, the first

the inputs of each of which are connected to the outputs of the measuring-logic blocks 2 of the corresponding relay protection stages 4, and the outputs are connected to the S-inputs of the corresponding RS-flip-flops 12, the R-inputs of which are connected to the second closing contact 9 of the control key 7, and the outputs of each they are connected to the inputs of the corresponding first indicators 11 and to the inverted inputs of the corresponding first elements AND 10, the outputs of all the first elements AND 10 are connected to the inputs of the element OR 14, to you (L

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the second indicator 15, third 16. fourth 17 and fifth 18 elements And, delay element 19, third indicator 20 and second RS flip-flop 21, the output of which is connected to the input of the indicator 20 and the inverse input of the fifth element And 18, and the S-input through the delay element 19 is connected to the output of the third element AND 16 connected by the first input to the first closing contact 8 of the control key 7 with the neutral position, and the second input connected to the output of the fifth element And 18 connected also to the input of the switching mechanism switching device a 5 and interconnected second inputs of all second elements AND 13. The output of the output block 3 of the relay protection -1 is connected with the direct input of the fifth element AND 18 and the inverse iho / n of the fourth element 1/1 17, the direct input which is connected to the second closing contact 9 key, control 7 with a neutral position, and the output is connected to the R-input of the second RS-flip-flop 21.

The device works as follows.

A signal carrying information about the state of the protected object is formed in the input unit 1 by means of, for example, measuring current transformers and voltage and from the output outputs, to the inputs of the relay protection 4. In the absence of an emergency situation, there are no signals at the outputs to be protected. - logical blocks 2 of all stages of protection at the inputs and the output of its output unit 3, at the inputs and output of the fifth element I 18, at the input of the switching mechanism of the switching device 5. D mode of operation of the device without control key 7 is in the neutral position, the closing contacts of its 8 and 9 are open, and the signals at the inputs and outputs of all the first 10, second 13. third 16 and fourth 17 elements AND, all first RS-flip-flops 12, second RS-trigger 21, element OR 14, delay elements 19 are missing, and pse indicators 11. 15 and 20 are turned off.

During the control, the first contact 8 of control circuit 7 is closed. The signal from the source of the control signal 6 goes to the direct inputs of all the first elements AND 10 and appears on their outputs, since there are no signals from the inverse inputs of these elements. the first elements And 10 signals are sent to the conjugate inputs of the measuring logic blocks 2 of the relay protection 4 and through the OR 14 element to the input of the second indicator 15. The second indicator 15 is turned on, and

relay protection 4 begins to be checked. In addition, the signal arrives at the first input of the third element And 16. Since the response time of the various stages of the relay protection 4 increases with increasing numbers, then when it is in good condition, the signal appears first at the output of the measuring and logic unit 2i of the first protection stage, from where it is fed to the first input of the second element I 13i and to the first input of the output unit 3, appears at its output and enters the inverse input of the fourth element I 17 and to the direct input of the fifth element I 18. There is no signal in the inverse input of the last element therefore, it appears at its output and is fed to the second inputs of all the second elements And 13, to the input of the switching mechanism of the switching device 5 and to the second input of the third element And 16, at the first input of which a signal already exists. Coincidence of signals at both inputs of the third element 16 causes its activation, as a result of which the delay element 19 is triggered. The response time of the delay element 19 is taken longer than the return to the initial position of any of the stages of relay protection 4 when it is in good condition, but less than the tripping time of the switching mechanism of the switching device 5. The second element, And 13i, operates, with signals on both inputs. From the output of the element And 13i, the signal arrives at the S-input of the first RS-flip-flop 12h, which switches, resulting in a signal from its output being fed to the inverse input of the first element And 10i and to the first indicator 111. The first indicator 111 turns on, indicating When the first stage of relay protection 4 is detected as a result of the test, the signal at the output of the first element I Ute and the input of the measuring and logic unit 2i associated with it of the first stage of protection disappears. When the first stage is in good condition, it returns to its original state. The signals at the output of the measuring-logic unit 2i disappear, at the first input of the second element I 13i, at the first input and output of the output block 3 of the relay protection 4, at the direct input and output of the fifth element And 18, at the second input of the third element And 16, at the input of the delay element 19, which in this case does not have time to work. The signals at the second inputs of the second elements I 13, at the S input of the first PS flip-flop 12, at the input of the switching mechanism of the switching device 5 disappear, and the switch of the protected object does not have time to turn off. The first indicator 111 remains on, a signal indicating that the first stage of relay protection 4 has triggered as a result of the test, the second indicator 15 continues to light, indicates that the monitoring mode continues, and the third indicator 20 does not turn on in this case.

After counting the time delay of the second stage of protection, the signal appears at the output of its measuring and logic unit 22, from whose output it goes to the first input of the second element I 132, and, having passed through the output unit 3 and the fifth element And 18, is fed to the switching mechanism switching device 5, to the second inputs of all second elements AND 13 and to the second input of the third element And 16. A delay element 19 is triggered, the second element AND 132 is activated, the first RS flip-flop 122 switches, the first indicator 112 is turned on, and the second with relay protection 4, and the signal from the input of the measuring-logic unit 22 is removed as a result of the signal from the output of the first RS-flip-flop 122 to the inverse input of the first element AND 102. In a healthy state, the second protection stage 4 returns to its original position, as a result the signals at the output of its measuring and logic unit 22, at the output of the output unit 3, at the output of the fifth element I 18, at the input of the switching mechanism of the switching device 5 disappear. The delay element 19 does not have time to work, and the switch is protected The object being clicked is disabled.

Similarly, the actuation test is carried out in the process of monitoring all subsequent stages of the relay protection 4 and returning them to their original position. If the relay protection 4 is in good condition, after checking its last stage, the second indicator 15 turns off, indicating that the monitoring mode has ended, and all of the first indicators remain on, each of which signals that a specific protection stage 4 is triggered. Third indicator 20 in this case is not included.

If any relay protection stage 4 is faulty, as a result of which the signal does not appear at the output of the corresponding measuring-logic unit 2, the corresponding second element And 13 will not work, the corresponding first RS-trigger 12 will not switch and the corresponding first indicator will not turn on 11, signaling the failure of this stage of relay protection 4. The second indicator 15 in this case, after the end of the monitoring mode, will remain in

on, signaling that a signal is being input to the input of the defective protection stage. When all the protection stages 4 triggered as a result of the control are returned to the initial position with the specified time, the delay element 19 does not have time to work, the second RS flip-flop 21 does not work and the third indicator 20 does not turn on.

0 If, as a result of malfunctions in the circuit elements, any stage of relay protection 4 does not return to the initial state (or the time for its return is increased) after removing the signal from its input

5 of the measurement and logic unit 2, the signal remains at the output of the fifth element AND 18 for a time longer than the response time of the delay element 19. Therefore, the delay element 19 is triggered.

0 The signal from its output is fed to the S-input of the second RS-flip-flop 21, which switches, giving signals to the inverse input of the fifth element And 18 and to the input of the third indicator 20. The output signals disappear.

5, the fifth element And 18, at the input of the switching mechanism of the switching apparatus 5, at the second input of the third element And 16, and at all the second inputs of the elements And 13, the delay element returns to the original

0 position, the switch of the protected object does not have time to turn off, and the third indicator 20 is turned on, indicating that the relay protection stage 4 does not return to the initial state after the end5 of its test mode.

As a result, the signal from the output of the second RS flip-flop 21 to the inverse input of the fifth element I 18 is output; the signal at its output will be absent regardless of the presence

0 or no signal at the direct input of this element, the power supply circuit of the switching device of the switching device 5 will be blocked, signaling the operation of the remaining stages of the relay protection 4 as a result of the test will not be performed, since at the second inputs of all second elements I 13 signals in this case not according to ts. Therefore, after turning on the third indicator 20, it is necessary to transfer the control key 7 to the neutral position, i.e. finish the test mode, sn in signals from the inputs of the measuring-logic blocks 2 of the relay protection 4 and turning off the second indicator 15.

5 Thus, according to the status of the first 11, second 15 and third 20 indicators, the test result is recorded and the state of the relay protection is determined 4. Long-lasting illumination of all the first indicators 11. Short-term activation for the time of the second indicator 15 test and the third indicator not turned on 20 indicate the operation of all stages of relay protection 4 in the process of control and successful return to their original position. A prolonged activation of the second indicator 15, the disconnected state of the third indicator 20, and the non-ignition of one of the first indicators 11 signals that the corresponding relay protection level 4 is not triggered during the verification process and that it has returned to its original position after it has completed all of the activated steps. And, finally, the enabled state of the third indicator 20 indicates that that stage of relay protection 4, which last worked during the test (as indicated by the enabled state of the corresponding first indicator 11), did not return to the initial position after its completion or time its return exceeded the allowable.

To decrease the tripping signals of the relay protection 4 after the end of the monitoring mode, it is necessary to shortly close the second pin 9 of the control key 7. At the same time, the signal from the control signal 6 is sent to the R-inputs of all the first RS-flip-flops 12. The latter switch to the initial state, the signals at their outputs disappear and the first indicators 11 are turned off.

Similarly, the removal of the signal about the non-return of any stage of relay protection 4 to the initial state after its operation in the verification process is carried out. The signal from the source of the control signal 6 through the second closing contact 9 of the control key 7 is fed to the direct input of the fourth element AND 17. The signal at the output of the last depends on whether there is a signal at its inverse input associated with the output output block 3 of the relay protection 4. If some protection stage has not returned to its original state, the signal remains at the output of its output block 3 and, therefore, at the inverse of the fourth element I 17. In this case, the signal at the output At the fourth element AND 17, the second RS flip-flop 21 is not reset and the third indicator 20 does not turn off.

The third indicator 20 remains on, and the power supply circuit of the switching device of the switching apparatus 5 will be blocked until the signal at the output of the relay protection A, i.e. until the problem is resolved in

the chain of its untapped step. If the inclusion of the third indicator 20 is caused by an increase in the time for the return of some stage of relay protection 4 and by the time

closing the second contact 9 of the control key 7, it returned to its original state, as a result of which the signal at the output of the relay protection 4 disappeared, a signal appears at the output of the fourth element I 17 and

0 at the R input of the second RS flip-flop 21. The latter switches to the initial state, the signal at its output disappears, the third indicator 20 turns off, and the protection is put into operation by removing the signal from the inverted input of the fifth element 18.

When the relay protection 4 as a result of a short circuit, the signal from the output of the measuring-logic unit 2 of its triggered stage goes through the output unit 3 and the fifth element I 18 to the switching mechanism of the switching device 5, causing the switch to turn off, to the second input of the third element I 16 on all the second inputs of the second elements And 13

5 and to the first input of one of them, corresponding to the number of the activated protection level, causing it to fire. From the output of this element, the signal is sent to the S input of the corresponding first RS flip-flop 12,

0 which is thrown, causing one of the first indicators 11 to turn on. The turned on indicator 11 signals the operation of the relay protection 4 along the circuit of the corresponding level. Third element

5 and 16 in this case does not work, since at its first input, connected with the first closing contact 8 of the control key 7, there is no signal due to the open state of the latter. The delay element 19, the second RS-flip-flop 21 and the third indicator 20 do not work. To remove the signal that the relay protection 4 is triggered as a result of a short circuit, it is necessary to shortly close the second short-circuit

5 pin 9 of the control key 7.

This device improves the reliability of multi-stage relay protection by preventing shutdown actions in

Claims (1)

In the event of a failure to return to the initial state or with an increase in the return time after the termination of the verification mode as a result of the occurrence of faults in the circuit elements of any of the stages. Preserving the work of the protected element in this case increases the reliability of power supply to consumers. The invention The device for signaling and monitoring the health of relay protection by author. St. No. 1457013, distinguished by what. in order to increase the reliability by preventing the relay protection in the monitoring process of shutdown as a result of non-return to the initial state of any of its steps after the next check, a delay element is added to it, the third, fourth and fifth elements are And, the third indicator and the second RS trigger, the output of which is connected to the input of the third indicator and the inverse input of the fifth element And, and the S input through the delay element is connected to the output of the third element And, the first input of which connected to the first closing contact of the control key with a neutral position, and the second input is connected to the output of the fifth element I, the output terminal of the output unit through the direct input of the fifth element And connected to the input terminal of the switching mechanism of the switching device, the output terminal of the output unit is also designed to connection with the inverted input of the fourth element And, the direct input of which is connected to the second closing contact of the control key with the neutral position, and the output connected to the R input of the second RS-trigger a.